[management] Feature/grpc debounce msgtype (#5239)

* Add gRPC update debouncing mechanism

Implements backpressure handling for peer network map updates to
efficiently handle rapid changes. First update is sent immediately,
subsequent rapid updates are coalesced, ensuring only the latest
update is sent after a 1-second quiet period.

* Enhance unit test to verify peer count synchronization with debouncing and timeout handling

* Debounce based on type

* Refactor test to validate timer restart after pending update dispatch

* Simplify timer reset for Go 1.23+ automatic channel draining

Remove manual channel drain in resetTimer() since Go 1.23+ automatically
drains the timer channel when Stop() returns false, making the
select-case pattern unnecessary.

management/internals/controllers/network_map/controller/controller.go

@@ -247,7 +247,10 @@ func (c *Controller) sendUpdateAccountPeers(ctx context.Context, accountID strin
 			update := grpc.ToSyncResponse(ctx, nil, c.config.HttpConfig, c.config.DeviceAuthorizationFlow, p, nil, nil, remotePeerNetworkMap, dnsDomain, postureChecks, dnsCache, account.Settings, extraSetting, maps.Keys(peerGroups), dnsFwdPort)
 			c.metrics.CountToSyncResponseDuration(time.Since(start))
 
-			c.peersUpdateManager.SendUpdate(ctx, p.ID, &network_map.UpdateMessage{Update: update})
+			c.peersUpdateManager.SendUpdate(ctx, p.ID, &network_map.UpdateMessage{
+				Update:      update,
+				MessageType: network_map.MessageTypeNetworkMap,
+			})
 		}(peer)
 	}
 
@@ -370,7 +373,10 @@ func (c *Controller) UpdateAccountPeer(ctx context.Context, accountId string, pe
 	dnsFwdPort := computeForwarderPort(maps.Values(account.Peers), network_map.DnsForwarderPortMinVersion)
 
 	update := grpc.ToSyncResponse(ctx, nil, c.config.HttpConfig, c.config.DeviceAuthorizationFlow, peer, nil, nil, remotePeerNetworkMap, dnsDomain, postureChecks, dnsCache, account.Settings, extraSettings, maps.Keys(peerGroups), dnsFwdPort)
-	c.peersUpdateManager.SendUpdate(ctx, peer.ID, &network_map.UpdateMessage{Update: update})
+	c.peersUpdateManager.SendUpdate(ctx, peer.ID, &network_map.UpdateMessage{
+		Update:      update,
+		MessageType: network_map.MessageTypeNetworkMap,
+	})
 
 	return nil
 }
@@ -778,6 +784,7 @@ func (c *Controller) OnPeersDeleted(ctx context.Context, accountID string, peerI
 					},
 				},
 			},
+			MessageType: network_map.MessageTypeNetworkMap,
 		})
 		c.peersUpdateManager.CloseChannel(ctx, peerID)
 

management/internals/controllers/network_map/update_channel/updatechannel_test.go

@@ -25,11 +25,14 @@ func TestCreateChannel(t *testing.T) {
 func TestSendUpdate(t *testing.T) {
 	peer := "test-sendupdate"
 	peersUpdater := NewPeersUpdateManager(nil)
-	update1 := &network_map.UpdateMessage{Update: &proto.SyncResponse{
-		NetworkMap: &proto.NetworkMap{
-			Serial: 0,
+	update1 := &network_map.UpdateMessage{
+		Update: &proto.SyncResponse{
+			NetworkMap: &proto.NetworkMap{
+				Serial: 0,
+			},
 		},
-	}}
+		MessageType: network_map.MessageTypeNetworkMap,
+	}
 	_ = peersUpdater.CreateChannel(context.Background(), peer)
 	if _, ok := peersUpdater.peerChannels[peer]; !ok {
 		t.Error("Error creating the channel")
@@ -45,11 +48,14 @@ func TestSendUpdate(t *testing.T) {
 		peersUpdater.SendUpdate(context.Background(), peer, update1)
 	}
 
-	update2 := &network_map.UpdateMessage{Update: &proto.SyncResponse{
-		NetworkMap: &proto.NetworkMap{
-			Serial: 10,
+	update2 := &network_map.UpdateMessage{
+		Update: &proto.SyncResponse{
+			NetworkMap: &proto.NetworkMap{
+				Serial: 10,
+			},
 		},
-	}}
+		MessageType: network_map.MessageTypeNetworkMap,
+	}
 
 	peersUpdater.SendUpdate(context.Background(), peer, update2)
 	timeout := time.After(5 * time.Second)

management/internals/controllers/network_map/update_message.go

@@ -4,6 +4,19 @@ import (
 	"github.com/netbirdio/netbird/shared/management/proto"
 )
 
+// MessageType indicates the type of update message for debouncing strategy
+type MessageType int
+
+const (
+	// MessageTypeNetworkMap represents network map updates (peers, routes, DNS, firewall)
+	// These updates can be safely debounced - only the latest state matters
+	MessageTypeNetworkMap MessageType = iota
+	// MessageTypeControlConfig represents control/config updates (tokens, peer expiration)
+	// These updates should not be dropped as they contain time-sensitive information
+	MessageTypeControlConfig
+)
+
 type UpdateMessage struct {
-	Update *proto.SyncResponse
+	Update      *proto.SyncResponse
+	MessageType MessageType
 }